It was Eminem who finally put Rick Rubin up to the ice-bucket challenge, and not surprisingly, the producer/guru decided to take the whole thing to the next level. Rubin filled an entire bathtub with ice water, climbed in with just a bathing suit on, and then had several buckets poured over his his head. He did all that with a zen-like calm before getting out and walking away to do something awesome in the studio with Kanye (we’re just guessing about that last part). Watch it below, along with the Eminem video in which Rubin was challenged.